Texas Education Agency
Texas Gateway: Making and Verifying Conjectures About Three Dimensional Figures
Students will explore volume conjectures and solve problems by applying the volume formulas to composite figures.
National Council of Teachers of Mathematics
The Math Forum: Defining Geometric Figures
This site provides an in-depth definition of a two-dimensional figure and a three-dimensional figure. Related terms include arcs, vertices, polygon, and many more.
Math Is Fun
Math Is Fun: Mathopolis: Volume and Surface Area of Prisms
Practice finding the surface area and volume of some three-dimensional prisms.
Quia
Ixl Learning: Cross Sections
Brush up on your math skills relating to cross-sections then try some practice problems to test your understanding.
NumberNut
Number Nut: Shapes, Symbols and Colors: Three Dimensional Shapes
Describes the basic three-dimensional figures students will encounter in elementary Math and in the world around them, and makes mention of a few unusual ones.